Inside the tractor test lab a belt is shown attached from equipment within the wall to the Allis-Chalmers HD-19 crawler. Only a small portion of the crawler's tread and the attachment of the belt is shown in the left foreground. In the...

"Big and Little." Allis-Chalmers G & Allis-Chalmers HD19. One operator is seated on an Allis-Chalmers G alongside an Allis-Chalmers HD-19 Diesel crawler, on which two men are seated. The tractors are parked on the dirt test track.

"Test #397 of Allis-Chalmers HD-19 during one of the drawbar tests." Rear view of Allis-Chalmers HD-19 crawler rounding the corner of the track with the Adams test car and four load tractors behind it.

"Test no. 397. Max. drawbar pull test. 37,556 lbs pull was obtained. The Allis-Chalmers HD-19 crawler is on the test track towing the Adams test car. The latter is towed separately from the 4 "load tractors" because of the lesser strength of its...

"Test no. 397. Hitch arrangement for testing HD-19." Side-view of the hitch arrangement between the Allis-Chalmers HD-19 crawler and the tractors hitched behind it. The Adams test car is offset and is not in the line of pull. It only measures...

Hitch for loading units." The photo was taken from the rear of the Allis-Chalmers HD-19, facing the equipment that is hitched behind it. The central part of the image shows the special hitch attaching the Allis-Chalmers to the other tractors. The...

Max drawbar test no. 397. Allis-Chalmers HD-19. The Adams test car is between the HD19 and NOT in the direct pull line with the load tractors. It only meassured the pressure in the draft cylinder. A special hitch was designed for this test.